Static frequency-transformer.



M. JOLY.

STATI@ FREQUENCY TRANSFORMBR.

APPLIOATION FILED MAR. 29, 1911.

Patented Dec'. 1, 1914.

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where the the many different transformers are UNITED sTATEs PATENT oEEIcE.

MAURICE JOLY, or nonne LA REINE, FRANCE.

STATIC FRE'QUENCY-TRANSFORMER.

Application filed March 29,1911.

Toall wwm t may concern.' n

Be it known that I, MAURICE JOLY, a c1t1- zen'of the Republic of France, and residing in Bourg La Reina-Seine, France, have invented certain new Tand useful Improvements in Static Frequency-Transformers, of which the following-isa specification.

The object of the present invention is a method and an apparatus. :for transforming [an alternating current of any frequency into an alternat' lcurrentjwhese' frequency is a multiple ofqt e-former. y

he apparatus. comprises 4of two: separate transformers; sin -oiic at least of-*which the `magnetic circuit is formed of aaai'erro' magnetic metal orfalljoya- The primaries-of these colinected'in series, and the sec'ondaries' are alsbf'in 'series,-but-' so that the electromotive forces inducedbythe primary equenc'ies :are opposed,-v

Figuregl" of'V the l'accompanying1 drawing represents by" wayfof example the .system and connections for'fa static transformer for changing-afrom.y 'a:g"i venz frequency to one three times fas high., a diagram illustratingthe actioand relation of the currentsin ,the transformer.

The following description -concernsa case secondaryA i frequency* isan ff odd multiple-ofthe primary." f

Referringito Figi 1, which -illustrates v an arrange'lniifrrtv for-{changing from a given frequencyrtrgdne' three times ashigh, M; and M2 are 'the ;two magnetic circuits vofl whichY onlyfone-contains a; magnetic metal, P1 and l?.2 are the primarywinding's, 'S1' and S2 the inductance and'a 'capacity-in resonance for capacity for reinforcing thethird harmonic. At the terminals of the primaries P1@ and 2 a circuitis'shown comprising a self-inductance L Aand prevent any disturbance-of the source 'o primaryA current. Y i i The two transformers' have-.their prieA maries, connected series, and-their secondaries are connected equally in series in 'such manner that the induced electro-motive forces of the primary frequency are in' opposition. V

The primary current should raise the induction in one of the magnetic circuits sufficiently -igh during a part of the primary period that the permeability is reduced. Of arrangements which may Speccation of Letters Patent.

Y secondary coil half period. Under these secondary circuit of the a capacity C providedto for this harmonic, ample a self-inductance of negligible resist- V in resonance with the Y Patented'neen, m14, Serial No. 617,787.

be diii'erent, and soon( The other magnetic circuit, contrary to the first, must function withV a constant permeability. When the magnetizing current increases, the magnetic Y circuit is at rstfverypermeable, then it becomes very littleso in consequence of the saturation.

j The magnetic circuit of the first transformer is very rapidly saturatedl as soon as the primary current increases by only a very small value, while the magnetic circuit of the second transformer only t attains a saturation under increases of current which considerably exceed those of the initial current. From that it follows then that the electromotive forces induced in the second transformer at overcome those of the secondary coil'f of vthe Afirst transformer, whereupon then, however, this overbalancing takes place in the secondary coil of the second transformer, hereafteragain in the of the first, in which case the primary current goes to nothing, increases i and again' falls to zero, namely, during a conditions electromotive forces are produced in the combined same frequency.' as the primary, of triple frequency, and, of other godd harmonics of the primary frcquency, whose intensities rapidly decrease as the number of the harmonic rises. The :flux in the first transformer is represented by c1 and in the second transformer by c2, the forms of which are represented in Fig.

2. Their diiierence gives thesecondary iiuX,

which is,

as represented, of'triple frequency.' Th

eory andpractice show, that'short'cir-- cuiting the secondary causes the secondary electromotive force to vanish without" requiring any in the primary. i

More particularly an electromotive force of any given frequencycan be eliminated by causing the sepondary to supply a circuit which has an impendance as low as possible by including for eX- ance and` a. capacity sensibleA expenditure of energy y particular frequency of the electromotive.

I the correspondingU amount tive force.

the primary current.

an electromotive force of reinforced and .also of energy given suitable ca-I J the generating apparatus of the primary current, which may be another frequency transformer, is avoided by inserting, if possible, at the terminals of the primary a circuit with as low an impedance aspossible for this 4harmonic comprising for example in series a self-inductance ofJ/negligible resistance and a capacity in resonance with this harmonic.

Having thus described my invention and the best means i know of carrying the same i into practical effect, I claim comprising two ries are connected 1n series and whose secf having` one o;

l. Apparatus for transforming the fre- 'quency of an alternating current fromv a given value .to an odd multiple of this value transformers `whose primaomiariesV are opposed, said transformers dierent induction characteristics, the transformers having a magnetic circuit in which the induction is such as to i-'educe the permeability during some part of the primary period. A

2. Apparatus for transforming .the fr quency of an 'alternating current fromza given value to an odd multiple of this value comprising two transformers whose primaries are connected'in series and whose secondaries are opposed, said transformers having diierent induction characteristics, one of the transformers 'having a magnetic circuit in y/vi/hich .the induction is such aste reduce the? permeability during some part of the .primary period, and a circuit having quency a neghgible impedance for a particular secondary harmonic for eliminating the electromotive force thereof.

3. Apparatus for transforming the freof an alternating current from a given value to :an odd multiple of this v alue comprisingtwo transformers whose primaries .are connected inseries and whose secendaries are opposed,

in shunt with the terminals of the tro-motive said transformers misses f Q ha di-Eerntfnduction vvcharacteristics,

one o the transformers havingl a magnetic -circuit in which tlnrimiuction'1s such as to reduce, thejpermeability during some part oftheprimary' period, and a suitable capacity placed across, the terminals of the secondary win for reinforcin the elec- .ef any particular armonie.

4. Apuaratiis for quency oan allternatin current from a comprising'vftwe tfermersyvnese primaries-'area 1M: ted in series-rand sec- -ondaries havin dierenft induction characteristics, one o the, transformers having-af-'gmagnetic circuit in which lthe induction'is suchasnto reduce the permeability-during .somelpart of the primarypelg'io'd i primary circuit for :preventing a harmonicl current flowing inthe primary circuit from` al1' eppeserL" transformers transforming fre.-

` given value toffanodid mu iple' off this value v.

disturbing the generating source, saidshunt circuit' having an impedance negligible for such harmonic.v4 1 w 5. Apparatus for transfo" g the -frequency of an' alternating from a given'value to an odd mltiple of-thi'sivalue, comprising two transformers whose prima# ries are connected in series andwhose. sec- 1 ondaries are opposed, said transformers hav- ^mg different induction character-fstics.

6. Apparatus for transforming the fre' quency of an alternating current from a given value to an odd multiple of this vaille, comprising two transformers whose primaries are connected in series and whose secondaries are opposed, said transformers having 'dierent induction characteristics,

said first transformer being adaptedto be come very rapidlysaturated when the pri- -mary current increases by a small value,

and said second transformer -being adapted to become saturated under considerably ginning in .the secondary coil of the first stronger increase of the primary current,v1n

transformer, then in that of the second, Y thereupon again in that of the first transformer, while the primary current beginning with zero increases and returns to zero, that is, passes through a half period. In witness whereof, I have hereunto signed my name in the presence of two subscrihin'g Witnesses.

' MAUBCE JOLY.

Witnessesz' A H. ;C. COKE, ALBERT BERG. 

